Which of the following was not a major advantage of Copernicus's Sun-centered model over the Ptolemaic model?
a. It made significantly better predictions of planetary positions in our sky.
b. It offered a more natural explanation for the apparent retrograde motion of planets in our sky.
c. It allowed calculation of the orbital periods and distances of the planets.
Answer: A
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The reaction energy (Q value) for a particular reaction is -2.4 MeV, and the reaction's threshold energy is 9.60 MeV. What is the ratio of the mass of the incident particle to the mass of the stationary target nucleus?
A) 4.0 B) 3.0 C) 0.75 D) 0.25 E) 5.0
A person has a near point of 40 cm and a far point of 1.0 m. When looking through lenses of focal length –1.0 m, what is the nearest an object can be to be seen clearly?
a. 29 cm b. 67 cm c. 134 cm d. 140 cm e. 68 cm
Sulfur has an atomic number of 16. What would be the valence number of this element?
A. One B. Two C. Three D. Four E. Six
Pure elements can be transformed into entirely different elements by
A) radioactive decay. B) transmutation. C) both of these D) neither of these